I guarantee you that if he tried that crap in a Japanese dojo, he would be unceremoniously tossed out the front door on his chin.

Not in any Japanese dojo I ever trained in. At one dojo, for instance, taught by the head of the entire federation, they had a fourth dan that was on the mat, during the same time, within the same class, teaching his own stuff on the mat! The Shihan would teach something and he say to his own little group of insiders, "No, not like that, that's wrong - like this."

No one said anything for at least five or six years!

Even then, I think he was finally asked to leave for some other "apparent" reason.